21333716 has 6 divisors (see below), whose sum is σ = 37334010. Its totient is φ = 10666856.

The previous prime is 21333707. The next prime is 21333727. The reversal of 21333716 is 61733312.

It can be written as a sum of positive squares in only one way, i.e., 21196816 + 136900 = 4604^2 + 370^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666711 + ... + 2666718.

It is an arithmetic number, because the mean of its divisors is an integer number (6222335).

Almost surely, 2^21333716 is an apocalyptic number.

It is an amenable number.

21333716 is a deficient number, since it is larger than the sum of its proper divisors (16000294).

21333716 is a wasteful number, since it uses less digits than its factorization.

21333716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333433 (or 5333431 counting only the distinct ones).

The product of its digits is 2268, while the sum is 26.

The square root of 21333716 is about 4618.8435782131. The cubic root of 21333716 is about 277.3461680194.

The spelling of 21333716 in words is "twenty-one million, three hundred thirty-three thousand, seven hundred sixteen".